Insights into Internet Privacy for Visually Impaired and Blind - PowerPoint PPT Presentation

Insights into Internet Privacy for Visually Impaired and Blind People Georg Regal , Elke Mattheiss, Marc Busch, Manfred Tscheligi Photo: AIT Austrian Institute of Technology/ Michael Bösendorfer

Internet Privacy  Personal data in the internet  Privacy is gaining importance  Concerns are increasing  Privacy Enhancing Technology  Protection of privacy  Control  Information  Educational effect 2 Networkgraphic - CC BY 2.5 0 by Rezonansowy: https://commons.wikimedia.org/wiki/File:Internet_map_1024_-_transparent,_inverted.png

Privacy is a Right for All Users Internet Accessibility Privacy 3

Related Work  Internet privacy and security for VIB users  Hochheiser et al. (2008) • Analysis of security and privacy challenges • For people with disabilities  Buzzi et al. (2009) • Trust of screen reader users • Guidelines how to promote trust for VIB  Sauer et al. (2008) • Problems with CAPTCHAs • Accessible human-proof tool 4

Behavioral Analysis  Companies collect and analyze user behavior  Tracker, Beacons, ...  Personalized advertisement  User profiles  Tracking Blocker  Monitor server calls  Block trackers  Inform 5

Accessibility of PET  We investigated  Privacy concerns of VIB Internet users  Accessibility of tracking blockers  We provide  Information material  Guidelines for an accessible tracking blocker 6

Privacy Concerns of VIB Internet Users

Method  Two workshops An online survey   A tool review of existing tracking blockers  User study - Interviews and observations 8

Accessibility of PET  High relevance of privacy protection  For partially sighted and blind  Detection of privacy problems (sometimes) more complicated  Stronger reliance on digital data 6

Online Survey  I consider this threat to be worrisome 14 12 10 totally disagree 8 disagree 6 undecided 4 agree 2 totally agree 0 Tracking Cloud- Search- Spyware Social Online Location- and Storages History und networks Shopping Based Behavioral Adware Data Analysis Analysis 10

Tool review Name Estimated accessibility • Can be accessed by keyboard • Interpreted correctly by screenreader Ghostery • Only the old version of the menu is accessible, the new version is not completely accessible Privacy Badger • Not accessible by keyboard only DisconnectMe • No information about keyboard accessibility Blur • No information about keyboard accessibility 11

User Study  Characteristics of Tracking Blockers  Prevention of Tracking  Accessibility  Usability  Information  Values  Privacy protection  Control  Equality of opportunity  Self-determination 12

Accessibility of Tracking Blockers

Method  Two workshops User Study – Comparative  tool testing 14

Method - Workshops  Feedback strategies  Workshop 1  Blind participants  Audio-only  Workshop 2  Partially sighted participants  Audio and visual 15

Guidelines  Feedback  Three levels of feedback • Harmless • Critical • Dangerous  Personalization  Choose desired feedback modalities 16

Visual Feedback Strategies 17

Acoustic Feedback Strategies  Ascending tunes  Descending tunes  Different tunes  Same tune multiple times  User Feedback  Not easy to distinguish  Different instruments suggested 18 Notes - CC-BY-SA-3.0by Hyacinth: https://commons.wikimedia.org/wiki/File:Quarter_note_run.png

Guidelines  Visual Feedback  Different symbols • Similar to traffic signs  Different shapes complemented by color  Sufficient contrast  Acoustic feedback  A short, concise tune if blocked  Preferably different sounds 19

Method – User Study  17 participants  3 predefined pages  No trackers  Little number of trackers  High number of trackers  Feedback and information  Developed interaction prototype  Comparison with the tool Ghostery 20

Guidelines  Control  Users define if a tracker is blocked or allowed  Global settings but changeable for specific sites  Keyboard operation for all options • Choose keyboard shortcuts  Information  Users prefer little automatic information • No disruption of the workflow • Quick access to further information 21

Accessible Tracking Blocker 22

Accessible Tracking Blocker 23

Accessible Tracking Blocker 24

Summary  Insight into privacy concerns of VIB users  Guidelines for accessible tracking blockers  http://blindfaith.tech-experience.at/

AIT Austrian Institute of Technology Georg Regal Innovation Systems Department Business Unit Technology Experience georg.regal@ait.ac.at